Button show listbox C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication11
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            AddMyGroupBox();
        }
        private void AddMyGroupBox()
        {
            // Create a GroupBox and add a TextBox to it.
            ListBox listBox1 = new ListBox();
            listBox1.BringToFront();
            listBox1.Location = new Point(330, 0);
            listBox1.Size = new Size(750, 350);
            listBox1.Items.Add("Starting to get good");

            // Set the Text and Dock properties of the GroupBox.



            // Disable the GroupBox (which disables all its child controls)
            button1.Enabled = false;

            // Add the Groupbox to the form.
            this.Controls.Add(listBox1);
        }




    }
}